[PARAMETER] Size 1: 14 x 14 x 7 mm / 0.55 x 0.55 x 0.28 inch (L*W*H); Color：Black. [FEATURE] This heatsink come with ordinary self adhesive(without function of conductive), easy to use, strong stickiness. [APPLICATION] The heatsink is a special tool for RPI 2B,as well as for cooling chips, stepper motor driver module and other small electronics that didn't come with any cooling. [MATERIAL] Aluminum alloy, great function for heat transfer. [PACKAGE CONTENT] Total 20 Pieces(10 Set)-10 x Size 1 Heatsink; 10 x Size 2 Heatsink.